SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492015-08-02T16:27:57-06:00SparkFun ElectronicsCustomer #479332 on DEV-11032 - ProtoSnap - LilyPad E-Sewing KitCustomer #479332urn:uuid:937ebd1b-2359-eb73-f18c-f966edd923d22013-10-16T14:54:00-06:00<p>thanks i&rsquo;d like the e-sewing ki</p>Ross MacLeod on DEV-11032 - ProtoSnap - LilyPad E-Sewing KitRoss MacLeodurn:uuid:6a98c5a5-d23d-774e-5c3a-8842127a25582013-10-11T15:54:33-06:00<p>it is indeed 3.3V typical (typ.) however LEDs actually have a range of forward voltages they can be driven at. At the higher end, they&rsquo;ll burn out faster (and nearly instantly if high enough) and at the low end it&rsquo;ll dim until it doesn&rsquo;t light. So, this LED can be driven at 3V but it&rsquo;ll be dimmer than what the data sheet says.</p>
<p>you can see a chart showing the relationship between forward voltage and the current draw, and then between the current draw and the luminosity (light output) on the data sheet&rsquo;s third page.</p>Customer #455237 on DEV-11032 - ProtoSnap - LilyPad E-Sewing KitCustomer #455237urn:uuid:c33552db-46e9-7134-08bb-032dd86ba4e22013-07-18T10:14:53-06:00<p>How much is VF value of LED?
If VF value is 3.3V as written on the data sheet, I do not understand the reason turned on by the coin battery of 3V.
Thank you for understanding my poor English.</p>